| 4501 | Taylor Energy Co. | | Oil & Gas Operator | May 1991 |
| 4502 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 4503 | TBR Operating Company Inc. | | Gas Operator | Dec 2024 |
| 4504 | Tchefuncte Natural Resources, L.L.C. | | Oil & Gas Operator | Aug 2011 |
| 4505 | TD & Associates, Inc. | | Oil & Gas Operator | Jun 1998 |
| 4506 | TDC Energy Corporation | | Oil & Gas Operator | Dec 2001 |
| 4507 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4508 | Teal Petroleum Co. | | Oil & Gas Operator | Sep 1978 |
| 4509 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Apr 2025 |
| 4510 | Tebco Oil & Gas | | Oil & Gas Operator | Sep 1996 |
| 4511 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 4512 | Tedco | | Gas Operator | Nov 1988 |
| 4513 | Tee Operating Company | | Oil & Gas Operator | Jun 1989 |
| 4514 | Teel 78 A | | Gas Operator | Dec 1980 |
| 4515 | Teel 79a | | Gas Operator | Dec 1980 |
| 4516 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 4517 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 4518 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 4519 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4520 | Tellus Operating Group, LLC | | Oil & Gas Operator | Jan 2025 |
| 4521 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Apr 2025 |
| 4522 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 4523 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4524 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 4525 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 4526 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Apr 2025 |
| 4527 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 4528 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Dec 2024 |
| 4529 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 4530 | Tennessee Gas Pipeline Company | Houston, TX 77252 | Oil & Gas Operator | Dec 2011 |
| 4531 | Tennessee Gas Pipeline Company, LLC | Houston, TX 77252 | Oil Operator | Dec 2024 |
| 4532 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 4533 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 4534 | Tensas Exploraton & Production Co LLC | | Oil & Gas Operator | Nov 2009 |
| 4535 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 4536 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 4537 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 4538 | Termo Co. Of Texas | | Oil & Gas Operator | Dec 1986 |
| 4539 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 4540 | Terral D Hinds | | Oil Operator | Mar 2012 |
| 4541 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 4542 | Terronne Petroleum Corporation | | Oil & Gas Operator | Nov 2024 |
| 4543 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 4544 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 4545 | Tervita, LLC | | Oil Operator | May 2021 |
| 4546 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 4547 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 4548 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 4549 | Tex-Con-Brehm-Basin Expl. | | Oil & Gas Operator | May 1990 |
| 4550 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 4551 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Apr 2025 |
| 4552 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 4553 | Texaco Inc & A.C. Glassell Jr | | Oil & Gas Operator | Aug 1980 |
| 4554 | Texaco Oils, Inc. | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 4555 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 4556 | Texada Resources, Inc. | | Oil & Gas Operator | Dec 1992 |
| 4557 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 4558 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Apr 2025 |
| 4559 | Texas City Refining, Inc. | | Oil & Gas Operator | Nov 1988 |
| 4560 | Texas Crude & Dale Gas Expl | | Oil & Gas Operator | Dec 1984 |
| 4561 | Texas Crude Exploration, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 4562 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 4563 | Texas Crude Oil Co. Et Al | | Oil & Gas Operator | May 1992 |
| 4564 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 4565 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 4566 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 4567 | Texas Crude-Rebstock & Reeves | | Oil & Gas Operator | Feb 1980 |
| 4568 | Texas Crude-Wainoco-Hilliard | | Oil & Gas Operator | Jul 1978 |
| 4569 | Texas Eastern Skyline Oil Co. | | Oil & Gas Operator | Jan 1987 |
| 4570 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 4571 | Texas Energy & Environmental Inc | Houston, TX 77269 | Oil & Gas Operator | Oct 1998 |
| 4572 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 4573 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 4574 | Texas Gas Transmission LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 4575 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 4576 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 4577 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 4578 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 4579 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4580 | Texas Pacific Oil Company Inc. | | Oil & Gas Operator | Dec 1980 |
| 4581 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Apr 2025 |
| 4582 | Texas T Oil Co. | | Oil & Gas Operator | Apr 1990 |
| 4583 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 4584 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | Apr 2025 |
| 4585 | Texegy Operating Company LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 4586 | Texex Petroleum Corporation | | Oil & Gas Operator | Dec 2024 |
| 4587 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Apr 2025 |
| 4588 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 4589 | Texoil Company | | Oil & Gas Operator | Dec 2000 |
| 4590 | Texoma Production Co | | Oil & Gas Operator | Jun 1986 |
| 4591 | Texona Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 4592 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 4593 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 4594 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 4595 | Tharp Operating Company | Houston, TX 77070 | Oil & Gas Operator | Nov 2014 |
| 4596 | The B&B Oil Co Of Sabine Inc | | Oil Operator | Jun 1982 |
| 4597 | The B&C Corp-Imp Amer MGT Co | | Oil & Gas Operator | Aug 1981 |
| 4598 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 4599 | The Bering Company | | Oil Operator | Jul 1979 |
| 4600 | The Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Jan 2025 |